mirror of https://github.com/slackhq/nebula.git
125 lines
3.1 KiB
Go
125 lines
3.1 KiB
Go
package main
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"strings"
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"time"
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"golang.org/x/crypto/ed25519"
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"github.com/slackhq/nebula/cert"
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)
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type caFlags struct {
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set *flag.FlagSet
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name *string
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duration *time.Duration
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outKeyPath *string
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outCertPath *string
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groups *string
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}
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func newCaFlags() *caFlags {
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cf := caFlags{set: flag.NewFlagSet("ca", flag.ContinueOnError)}
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cf.set.Usage = func() {}
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cf.name = cf.set.String("name", "", "Required: name of the certificate authority")
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cf.duration = cf.set.Duration("duration", time.Duration(time.Hour*8760), "Optional: amount of time the certificate should be valid for. Valid time units are seconds: \"s\", minutes: \"m\", hours: \"h\"")
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cf.outKeyPath = cf.set.String("out-key", "ca.key", "Optional: path to write the private key to")
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cf.outCertPath = cf.set.String("out-crt", "ca.crt", "Optional: path to write the certificate to")
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cf.groups = cf.set.String("groups", "", "Optional: comma separated list of groups. This will limit which groups subordinate certs can use")
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return &cf
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}
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func ca(args []string, out io.Writer, errOut io.Writer) error {
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cf := newCaFlags()
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err := cf.set.Parse(args)
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if err != nil {
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return err
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}
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if err := mustFlagString("name", cf.name); err != nil {
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return err
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}
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if err := mustFlagString("out-key", cf.outKeyPath); err != nil {
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return err
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}
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if err := mustFlagString("out-crt", cf.outCertPath); err != nil {
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return err
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}
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if *cf.duration <= 0 {
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return &helpError{"-duration must be greater than 0"}
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}
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groups := []string{}
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if *cf.groups != "" {
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for _, rg := range strings.Split(*cf.groups, ",") {
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g := strings.TrimSpace(rg)
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if g != "" {
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groups = append(groups, g)
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}
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}
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}
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pub, rawPriv, err := ed25519.GenerateKey(rand.Reader)
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if err != nil {
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return fmt.Errorf("error while generating ed25519 keys: %s", err)
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}
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nc := cert.NebulaCertificate{
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Details: cert.NebulaCertificateDetails{
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Name: *cf.name,
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Groups: groups,
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(*cf.duration),
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PublicKey: pub,
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IsCA: true,
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},
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}
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if _, err := os.Stat(*cf.outKeyPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing CA key: %s", *cf.outKeyPath)
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}
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if _, err := os.Stat(*cf.outCertPath); err == nil {
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return fmt.Errorf("refusing to overwrite existing CA cert: %s", *cf.outCertPath)
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}
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err = nc.Sign(rawPriv)
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if err != nil {
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return fmt.Errorf("error while signing: %s", err)
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}
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err = ioutil.WriteFile(*cf.outKeyPath, cert.MarshalEd25519PrivateKey(rawPriv), 0600)
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if err != nil {
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return fmt.Errorf("error while writing out-key: %s", err)
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}
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b, err := nc.MarshalToPEM()
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if err != nil {
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return fmt.Errorf("error while marshalling certificate: %s", err)
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}
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err = ioutil.WriteFile(*cf.outCertPath, b, 0600)
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if err != nil {
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return fmt.Errorf("error while writing out-crt: %s", err)
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}
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return nil
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}
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func caSummary() string {
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return "ca <flags>: create a self signed certificate authority"
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}
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func caHelp(out io.Writer) {
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cf := newCaFlags()
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out.Write([]byte("Usage of " + os.Args[0] + " " + caSummary() + "\n"))
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cf.set.SetOutput(out)
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cf.set.PrintDefaults()
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}
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